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The PRAMS sample consistently linked with between 9% and 10% of PFD, CPS, APD, and CAC records (see Additional file 1: Table S3 for linkage rate details for ALCANLink project).
The linkage rate was 99%.
For linkage between in-hospital death data and the Vital Statistics registry, the same combination achieved a linkage rate of 93.1% and a correct linkage rate of 98.9%.
The combination of all four identifiers (first, surname, sex and date of birth) resulted in an even lower linkage rate with little increase in the correct linkage rate.
Adding first name to the combination of identifiers increased the correct linkage rate no more than 1%, but at the cost of decreasing the linkage rate almost 10%.
Among the three categories of non-institutional collective dwellings studied, rooming houses had the highest linkage rate (41%) and shelters had the lowest linkage rate (26%).
In our study, a combination of surname, sex and date of birth has the highest linkage rate and second highest correct linkage rate.
The linkage rate improved to 60% when date of birth and hospital name was used.
With more identifiers available the linkage rate in this study should be improved considerably.
Eighteen studies looked at the relationship between participants' age and linkage rate.
They found that with the improvement in data quality, the record linkage rate improved significantly.
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CEO of Professional Science Editing for Scientists @ prosciediting.com